At the end of a sponge ball routine one of the one inch sponge balls is placed into the center of an eighteen inch silk...

The four corners of the silk are twisted and a spectator is allowed to squeeze the ball thru the silk. Magi removes some of the invisible vitamin B-1 from his pocket and sprinkles it on the silk covered ball.

With all eyes on the ball, a very beautiful effect happens. The ball is seen to visibly get larger and larger, and start filling out the silk. It looks almost as though a balloon were being inflated slowly under the silk as the ball grows larger.

It finally stops growing. The silk is held by the four corners with the right hand and rests on the left palm.

The right hand releases its four corners which allow the silk to drop down over the left palm disclosing a large sponge ball -- THE SIZE OF A GRAPEFRUIT.